Below article was written by Kazbek Tursun during his internship in our science team. He digged deep into our massive co-location data and saw some significant deviations just based on the type of reference stations used. What he uncovers raises some profound questions on how we evaluate data from reference stations. The results from reference instruments using the BAM method are actually quite shocking. These expensive “gold standard” instruments show such poor hourly correlation with lo...